I googled " import .pst file" and there are lots of hits.

try this:

support.microsoft.com/kb/287070

Judy Gleeson, MVP Outlook
Acorn Training and Consulting
www.acorntraining.com.au

Everyone - turn on your Advanced Toolbars and learn how to use the Field
Chooser and Group by Box!!

Don't import, for starters.
The file you need is your Personal Folders file (*.pst) It's where all the
mail, calendar, contacts etc are stored.

Take a look at these pages for info on Outlook data backup or transfer:
http://www.slipstick.com/config/backup.htm
http://www.howto-outlook.com/Howto/backupandrestore.htm
http://office.microsoft.com/en-us/assistance/HA010771141033.aspx